SYSAUX表空间清除统计信息

查看SYSAUX信息

set linesize 120
set pagesize 100
 
COLUMN "Item" FORMAT A25
COLUMN "Space Used (GB)" FORMAT 999.99
COLUMN "Schema" FORMAT A25
COLUMN "Move Procedure" FORMAT A40
 
SELECT  occupant_name "Item",
    space_usage_kbytes/1048576 "Space Used (GB)",
    schema_name "Schema",
    move_procedure "Move Procedure"
FROM v$sysaux_occupants
ORDER BY 1
/

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col OCCUPANT_NAME for a25
col OCCUPANT_DESC for a60
col SCHEMA_NAME for a20
col MOVE_PROCEDURE for a40
col SPACE_USAGE_KBYTES for a20
select OCCUPANT_NAME,OCCUPANT_DESC,SCHEMA_NAME,MOVE_PROCEDURE,SPACE_USAGE_KBYTES from v$sysaux_occupants where occupant_name='LOGMNR';

保留多久的旧统计数据

1	`select dbms_stats.get_stats_history_retention from dual;`

将旧统计信息的保留时间设置为10天

1	`exec dbms_stats.alter_stats_history_retention(10);`

清除超过10天的统计数据（如果有大量数据（sysdate-30，sydate-25等），最好分阶段执行此操作

1	`exec DBMS_STATS.PURGE_STATS(SYSDATE-10);`

显示尚未清除的可用统计信息

1	`select dbms_stats.get_stats_history_availability from dual;`

显示表的大小，并在清除统计信息后重建

col Mb form 9,999,999
col SEGMENT_NAME form a40
col SEGMENT_TYPE form a6
set lines 120
select sum(bytes/1024/1024) Mb, segment_name,segment_type from dba_segments
where  tablespace_name = 'SYSAUX'
and segment_name like 'WRI$_OPTSTAT%'
and segment_type='TABLE'
group by segment_name,segment_type order by 1 asc

显示清除统计信息后索引为重建做好准备的程度

col Mb form 9,999,999
col SEGMENT_NAME form a40
col SEGMENT_TYPE form a6
set lines 120
select sum(bytes/1024/1024) Mb, segment_name,segment_type from dba_segments
where  tablespace_name = 'SYSAUX'
and segment_name like '%OPT%'
and segment_type='INDEX'
group by segment_name,segment_type order by 1 asc
/

请注意，由于索引是基于函数的，因此无法启用行移动和缩小表

alter table WRI$_OPTSTAT_IND_HISTORY enable row movement;

alter table WRI$_OPTSTAT_IND_HISTORY shrink space;

*

ERROR at line 1:

ORA-10631: SHRINK clause should not be specified for this object

select 'alter table '||segment_name||' move tablespace SYSAUX;' from dba_segments where tablespace_name = 'SYSAUX'

and segment_name like '%OPT%' and segment_type='TABLE'

运行rebuild table命令 - 请注意，这会导致任何gather_stats作业失败

alter table WRI $ _OPTSTAT_TAB_HISTORY move tablespace sysaux; 
alter table WRI $ _OPTSTAT_IND_HISTORY move tablespace sysaux; 
alter table WRI $ _OPTSTAT_HISTHEAD_HISTORY move tablespace sysaux; 
alter table WRI $ _OPTSTAT_HISTGRM_HISTORY move tablespace sysaux; 
alter table WRI $ _OPTSTAT_AUX_HISTORY move tablespace sysaux; 
alter table WRI $ _OPTSTAT_OPR move tablespace sysaux; 
alter table WRH $ _OPTIMIZER_ENV move tablespace sysaux;</span>

用于生成重建语句的脚本

select 'alter index '||segment_name||'  rebuild online parallel (degree 14);' from dba_segments where tablespace_name = 'SYSAUX'
and segment_name like '%OPT%' and segment_type='INDEX'

完成后，最好检查索引（索引）是否可用

select  di.index_name,di.index_type,di.status  from  dba_indexes di , dba_tables dt
where  di.tablespace_name = 'SYSAUX'
and dt.table_name = di.table_name
and di.table_name like '%OPT%'
order by 1 asc
/

最后，让我们看看保存日期为1天的空间以及SYSASDM模式的收集模式统计信息

exec dbms_stats.alter_stats_history_retention(1);
select dbms_stats.get_stats_history_retention from dual;

SYSAUX表空间清除统计信息

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